Learning to see is the most important thing. Who cares what cameras are used?

Film can be good, because it teaches patience and a contemplative approach, and with manual cameras forces an understanding of the mechanics of aperture, shutter speed, film speed, etc.
Digital can be good, because it teaches composition, framing, and light very effectively, with immediate feedback, where you can see what went wrong.

I think in this day and age a combination of both is good, but don't ever lose track of helping the student to see. You can use a Diana or a Hasselblad H-series. If you can't see the rest is pretty much worthless. You can't polish a turd, as they say.